US3864291A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Kraft or soda black liquor adhesive and procedure for making the same
Assignee: Individual
•
Filing: 1973-07-05
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Granted: 1975-02-04
•
Expires: 1993-07-05
Abstract
Abstract Alkaline, water soluble adhesives based on kraft or soda black liquors from the pulping industry and combined with adhesives made from phenols and formaldehyde, formalin, paraformaldehyde or other formaldehyde containing or developing substances, and intended for glueing e.g. plywood and particle board.
Inventors
- 👤 Terje Ulf Eugen Enkvist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:30
CPC Classifications
C; C09; C09J; C09J161/00; C09J161/04; C09J161/06; C09J161/14; C08; C08G; C08G8/00; C08G8/28
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
78 words
A PROCESS FOR PREPARING AN ADHESIVE BASED ON BLACK LIQUOR FROM THE PULPING INDUSTRY HAVING A DRY MATTER CONTENT OF MORE THAN 25%, COMPRISING REACTING THE BLACK LIQUOR WITH A FORMALDEHYDE OR CRESOL TO FORM AN ADHESIVE AND COMBINING IT WITH A SEPARATELY PREPARED PHENOL-FORMALDEHYDE OR CRESOLFORMALDEHYDE ADHESIVE IN PROPORTIONS SUCH THAT THE AMOUNT OF PHENOL OR CRESOL USED IS 15-50% OF THE SUM OF THE PHENOL OR CRESOL USED AND THE ORGANIC MATTER OF THE BLACK LIQUOR.
Claim 2
Dependent Claim
78 words
A PROCESS FOR PREPARING AN ADHESIVE BASED ON BLACK LIQUOR FROM THE PULPING INDUSTRY HAVING A DRY MATTER CONTENT OF MORE THAN 25%, COMPRISING REACTING THE BLACK LIQUOR WITH A FORMALDEHYDE OR CRESOL TO FORM AN ADHESIVE AND COMBINING IT WITH A SEPARATELY PREPARED PHENOL-FORMALDEHYDE OR CRESOLFORMALDEHYDE ADHESIVE IN PROPORTIONS SUCH THAT THE AMOUNT OF PHENOL OR CRESOL USED IS 15-50% OF THE SUM OF THE PHENOL OR CRESOL USED AND THE ORGANIC MATTER OF THE BLACK LIQUOR.
Claim 3
Dependent Claim
30 words
A procedure according to claim 1 wherein the black liquor and additional formaldehyde or cresol are added to the phenol-formaldehyde or cresol formaldehyde adhesive and heated in the same vessel.
Claim 4
Dependent Claim
34 words
A procedure according to claim 1 wherein the value of pH is between 7 and 11, measured after dilution of 1 part by weight of adhesive with 10 parts of weight of pure water.
Claim 5
Dependent Claim
37 words
A procedure according tO claim 1 wherein an amount of formalin or paraformaldehyde of 2-15 % calculated as formaldehyde on the total organic matter of the adhesive is added after the heating of the adhesive reaction mixture.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |